.square-shell-grid{width:100%;margin-block:var(--space-3)}.square-shell-grid svg{width:100%;max-width:460px;height:auto;margin-inline:auto;display:block}.square-shell-grid text{font-family:var(--font-body);fill:var(--ink)}.shell-index{font-size:13px}.shell-number{font-size:23px;font-weight:650}.shell-cell{fill:var(--surface-soft);stroke:var(--line);stroke-width:1px}.shell-cell[data-active]{fill:var(--accent-soft);stroke:var(--emphasis);stroke-width:2.5px}.shell-target{fill:none;stroke:var(--diagram-third);stroke-width:3px;stroke-dasharray:4 2}.shell-boundary{fill:none;stroke:var(--line-strong);stroke-width:1.5px}.shell-key{color:var(--muted);font-size:var(--text-support);line-height:1.7}.shell-equation{padding:var(--space-3);border-block:1px solid var(--line);text-align:center;font-size:1.1rem;line-height:1.9}.shell-equation strong{color:var(--emphasis)}.shell-strip{gap:var(--space-2);margin-block:var(--space-4);padding-block:var(--space-2);grid-auto-columns:minmax(56px,1fr);grid-auto-flow:column;display:grid;overflow-x:auto}.shell-strip>span{border:1px solid var(--line);text-align:center;padding:8px 3px}.shell-strip small{color:var(--muted);font-size:var(--text-hint);display:block}.shell-strip b{font-size:1.15rem;display:block}.shell-strip [data-target]{border:3px solid var(--emphasis);background:var(--accent-soft)}.shell-controls{gap:var(--space-3);grid-template-columns:1fr 1fr;display:grid}.shell-controls label{gap:var(--space-2);display:grid}.shell-controls select{width:100%;min-height:48px;font:inherit;background:var(--surface);color:var(--ink);border:1px solid var(--line-strong);border-radius:var(--radius-small)}.shell-static-steps details{margin-block:var(--space-4)}@media (width<=420px){.shell-number{font-size:25px}.shell-index{font-size:14px}}